Predicted times are corrected for BST when necessary and based on ideal weather conditions. Please only use as an approximate guide and at your own risk.

Astronomical Twilight

Astronomical twilight is when the center of the sun is between 12° and 18° below the horizon. From the end of astronomical twilight in the evening to the beginning of astronomical twilight in the morning, the sky away from light pollution is dark enough for all astronomical observations (more).

Nautical Twilight

Nautical twilight is the time when the center of the sun is between 6° and 12° below the horizon. In general, nautical twilight ends when navigation via the horizon at sea is no longer possible (more).

Civil Twilight

Morning civil twilight (civil dawn) begins when the center of the sun is 6° below the horizon and ends at sunrise. Evening civil twilight (civil dusk) begins at sunset and ends when the geometric center of the sun reaches 6° below the horizon (more).